- Require authentication on cameras and media servers.
- Keep IP cameras and recorders off the Internet; use a VPN for remote viewing.
- Update device firmware.
Port 3337: Direct TV Data Catalog
Port 3337 is assigned by IANA to directv-catlg (Direct TV Data Catalog).
3337
How directv-catlg works
Media & streamingThe device streams video frames over port 3337, continuously, as they are captured.
- Transport
- TCP · UDP
- Exposure risk
- not rated depends on the program listening
- Encryption
- Unknownnot stated by the registry
- IANA status
- Assigned1 registered service
- Range
- Registered (1024-49151)
- Category
- Media & streaming
Is port 3337 dangerous?
We have no specific security note for port 3337. Its risk depends on the program actually listening on it. General advice for media & streaming services:
IANA registry entries for port 3337
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| directv-catlg | 3337 | TCP, UDP | Direct TV Data Catalog | - | - |
// source: IANA service name and port number registry
Which program uses port 3337, and is it reachable?
Linux
sudo ss -ltnup 'sport = :3337' # process listening on 3337
sudo lsof -nP -i :3337macOS
sudo lsof -nP -i :3337
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3337 -State Listen | Select LocalAddress, OwningProcess Get-NetUDPEndpoint -LocalPort 3337 netstat -ano | findstr :3337
From another machine
nmap -p 3337 -sV <host> sudo nmap -sU -p 3337 <host> nc -zv <host> 3337
Block it in the firewall
sudo ufw deny 3337/tcp # Linux (ufw) New-NetFirewallRule -DisplayName "Block 3337" -Direction Inbound -LocalPort 3337 -Protocol TCP -Action Block # Windows
What is port 3337 used for?
Port 3337 is assigned by IANA to directv-catlg (Direct TV Data Catalog).
Is port 3337 TCP or UDP?
Port 3337 is registered for TCP and UDP.
Is it safe to open port 3337?
It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Require authentication on cameras and media servers.
How do I check if port 3337 is open?
On Linux run "ss -ltnup 'sport = :3337'", on macOS "lsof -nP -i :3337", and on Windows "netstat -ano | findstr :3337" to see the local process. From another machine, "nmap -p 3337 <host>" shows whether it is reachable.